u.s. persons and interests will take place in the immediate future. now, the memo also has new details on legal case behind more drone strikes against al qaeda suspects. such as a strike happened in yemen in september 2011 killing alleged al qaeda operatives, both american citizens not indicted or charged with crimes. all of this could come to a head on thursday for john brennan. eight democratic and three republican senators have written to president obama asking for the legal opinions authorizing the killing of americans. joining me now, national investigative correspondent michael isacoff. i saw your report and the reaction to the report. is it really surprising at this point? >> well, i think it's not that surprising, mainly because the administration has been so resistant to releasing any of the memos that explain its legal reasoning behind these drone strikes and in particular the drone strikes targeting american citizens. members of congress have asked to see copies. "the new york t